[skip ci] Remove duplicate icu dep on 8.4+

I see those were already added there

Author: iluuu1994

.github/actions/brew/action.yml

@@ -22,7 +22,6 @@ runs:
           enchant \
           libffi \
           intltool \
-          icu4c \
           libiconv \
           t1lib \
           libxml2 \